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参数资料
| 型号： | MAX15022ATI+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC REG QD BCK/LINEAR SYNC 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 拓扑： | 降压（降压）同步（2），线性（LDO）（2） |
| 功能： | 任何功能 |
| 输出数： | 4 |
| 频率 - 开关： | 500kHz ~ 4MHz |
| 电压/电流 - 输出 1： | 0.6 V ~ 5.5 V，4A |
| 电压/电流 - 输出 2： | 0.6 V ~ 5.5 V，2A |
| 电压/电流 - 输出 3： | 控制器 |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 管件 |
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Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Dual LDO Controllers
Error Amplifier
The output of the internal voltage-mode error amplifier
(COMP_) is provided for frequency compensation (see
the Compensation Design Guidelines section). FB_ is
the inverting input of the error amplifier. The error
amplifier has an 80dB open-loop gain and a 12MHz
gain bandwidth (GBW) product.
CURRENT LIMIT
IN
COUNT OF 4
N CL
CLR
INITIATE HICCUP
TIMEOUT
N HT
Output Short-Circuit
Protection (Hiccup Mode)
The MAX15022 features lossless, high-side peak cur-
rent limit and low-side, valley current limit. At short duty
cycles, both limits are active. At high duty cycles, only
the high-side peak current limit is active. Either limit
causes the hiccup mode counter (N CL ) to increment.
For duty cycles less than 50%, the low-side valley cur-
IN
CLR
COUNT OF 3
N CLR
R T [ k ? ] = SW
rent limit is active. Once the high-side MOSFET turns off,
the voltage across the low-side MOSFET is monitored. If
this voltage does not exceed the current-limit threshold
at the end of the cycle, the high-side MOSFET turns on
normally at the start of the next cycle. If the voltage
exceeds the current-limit threshold just before the
beginning of a new PWM cycle, the controller skips that
cycle. During severe overload or short-circuit condi-
tions, the switching frequency of the device appears to
decrease because the on-time of the low-side MOSFET
extends beyond a clock cycle.
If the current-limit threshold is exceeded for more than
four cumulative clock cycles (N CL ), the device shuts
down for 8192 clock cycles (hiccup timeout) and then
restarts with a soft-start sequence. If three consecutive
cycles pass without a current-limit event, the count of
N CL is cleared (see Figure 3). Hiccup mode protects
the device against a continuous output short circuit.
The internal current limit is constant from 5.5V down to
3V and decreases linearly by 50% from 3V to 2V. See
the Electrical Characteristics table.
Thermal-Overload Protection
The MAX15022 features an integrated thermal-overload
protection with temperature hysteresis. Thermal-over-
load protection limits the die temperature of the device
and protects it in the event of an extended thermal fault
condition. When the die temperature exceeds +160°C,
an internal thermal sensor shuts down the device, turn-
ing off the internal power MOSFETs and allowing the die
to cool. After the die temperature falls by +15°C (typ),
the device restarts with a soft-start sequence.
Startup into a Prebiased Output
(Sequencing Mode)
In sequencing mode, the regulators start with minimal
glitch into a prebiased output and soft-stop is disabled.
Figure 3. Hiccup-Mode Block Diagram
During soft-start, both switches are kept off until the
PWM comparator commands its first PWM pulse. Until
then, the converters do not sink current from the out-
puts. The first PWM pulse occurs when the ramping ref-
erence voltage increases above the FB_ voltage.
LDO Controllers
The MAX15022 provides two additional LDO controllers
to drive external PNP pass transistors. Connect the emit-
ter of each PNP pass transistor to either the input supply
or one of the controller 1 or 2 outputs. Each LDO con-
troller features an independent enable input and digital
soft-start. Connect FB3 and FB4 to the center tap of a
resistive divider from the output of the desired LDO con-
troller to SGND to set the output voltage.
PWM Controllers
Design Procedure
Setting the Switching Frequency
Connect a 4.2k ? to 33k ? resistor from RT to SGND to
program the switching frequency (f SW ) from 500kHz to
4MHz. Calculate the required resistor value R T to set
the switching frequency with the following equation:
f [kHz] × 1.067[V]
32 [ μ A ] × 4[MHz]
Higher frequencies allow designs with lower inductor
values and less output capacitance. At higher switch-
ing frequencies core losses, gate-charge currents,
and switching losses increase. When operating from
V AVIN < 3V, the f SW frequency should be derated to
3MHz (maximum).
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15022ATI+ | 功能描述:直流/直流开关调节器 Dual 4A/2A 4MHz w/Dual LDO Ctlr RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX15022ATI+T | 功能描述:直流/直流开关调节器 Dual 4A/2A 4MHz w/Dual LDO Ctlr RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX15022EVKIT+ | 功能描述:电源管理IC开发工具 MAX15022 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX15023ETG/V+ | 功能描述:DC/DC 开关控制器 4.5-28V Input Dual Out Synch Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15023ETG/V+T | 功能描述:DC/DC 开关控制器 4.5-28V Input Dual Out Synch Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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